Re: [CCAMP] [Technical Errata Reported] RFC9094 (7054)

________________________________________
From: CCAMP <ccamp-bounces@ietf.org> on behalf of RFC Errata System <rfc-editor@rfc-editor.org>
Sent: 29 July 2022 11:40
To: zhenghaomian@huawei.com; younglee.tx@gmail.com; aihuaguo.ietf@gmail.com; victor.lopez@nokia.com; d.king@lancaster.ac.uk; aretana.ietf@gmail.com; jgs@juniper.net; andrew-ietf@liquid.tech; daniele.ceccarelli@ericsson.com; zhangfatai@huawei.com
Cc: jlindbla@cisco.com; ccamp@ietf.org; rfc-editor@rfc-editor.org
Subject: [CCAMP] [Technical Errata Reported] RFC9094 (7054)

The following errata report has been submitted for RFC9094,
"A YANG Data Model for Wavelength Switched Optical Networks (WSONs)".

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You may review the report below and at:
https://www.rfc-editor.org/errata/eid7054

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Type: Technical
Reported by: Jan Lindblad <jlindbla@cisco.com>

<tp>

I think that Jan is right in the sense that

- the author did not understand the YANG that they specified (or at least the XML part)
- it renders the when clause more or less meaningless

It is also very widespread across WG and I-D/RFC which makes fixing it a challenge (a bit like having or not having zone in an ip-address type).

It is also a technical change to what the WG endorsed at the time.

Challenging!

Tom Petch

Section: 3

Original Text
-------------
  augment "/nw:networks/nw:network/nw:node/tet:te"
        + "/tet:te-node-attributes" {
    when '/nw:networks/nw:network/nw:network-types'
       + '/tet:te-topology/wsont:wson-topology' {
      description
        "Augmentation parameters apply only for networks with
         WSON topology type.";
    }

Corrected Text
--------------
  augment "/nw:networks/nw:network/nw:node/tet:te"
        + "/tet:te-node-attributes" {
    when '../../../nw:network-types/tet:te-topology/'
       + 'wsont:wson-topology' {
      description
        "Augmentation parameters apply only for networks with
         WSON topology type.";
    }

Notes
-----
The original YANG statements make the augmentation apply to all nw:networks as soon as there is at least one nw:network that is of wsont:wson-topology. This is clearly not the author's intent, as proven by the text in the description statement.

The corrected YANG statements make the augmentation only apply to the specific nw:networks that are of wsont:wson-topology type. There are also other ways to fix this issue.

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-------------
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RFC9094 (draft-ietf-ccamp-wson-yang-28)
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Title               : A YANG Data Model for Wavelength Switched Optical Networks (WSONs)
Publication Date    : August 2021
Author(s)           : H. Zheng, Y. Lee, A. Guo, V. Lopez, D. King
Category            : PROPOSED STANDARD
Source              : Common Control and Measurement Plane
Area                : Routing
Stream              : IETF
Verifying Party     : IESG

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